Just as you would add two numbers such as 2+3, you add two square roots in a similar fashion. The only difference between adding two square roots and adding two rational numbers (1,2,3…) is that you might not be able to simplify the answer down to a single number. Instead, you might be left with the most basic form, but still have a square root in there. When dealing with the addition of square roots, this is an entirely plausible and possible situation. How to Add Square Roots When you Read More

Proxy Server Arrays Overview Proxy Server provides a feature called proxy arrays. A proxy array is a solution whereby one or multiple proxy servers operate as a single cache for client requests. Each Proxy Server server that belongs to the proxy array performs the following functions: Maintains membership information for the proxy array. This information provides input on which array members are available and which array members are unavailable. A client therefore has to only query one array member because each member of the proxy array maintains information on all Read More

A common error encountered by Microsoft Windows users when trying to read or write from a drive, disk, or portable media device is the I/O device error. When this error is generated, the transfer mode that the operating system is attempting to use for the operation may not be recognized. The I/O error may be experienced with various media storage devices such as: external hard drives, DVD or CDs, DVD or CD drives, SD cards, or USB sticks/drives. Common causes of the error include faulty hardware, a loose connection between Read More

Windows Messenger is an instant messaging software that is automatically installed on all versions of the Windows Operating System. Windows Messenger allows users to communicate with friends via instant messages, text messages, and email, as well as via audio and video calls. Windows Messenger allows users to create a unique profile and is able to record instant messaging history for later review. Windows Messenger vs Windows Live Messenger Windows Messenger differs from Windows Live Messenger in several ways. While Windows Messenger is the default instant messaging software on the Windows Read More

eBay is the worlds largest auction site. eBay stores personal information about you. If your eBay password were to fall into the wrong hands, if could create significant difficulties for you. How to Change Your eBay Password Go to the eBay Change Password and Create Hint page. Enter your eBay User ID. Enter your password. Click the button. Enter your old password. Enter your new password. Re-enter your new password. Click the button.For more tips on using eBay, visit Buying and Selling on eBay.For more information on using eBay, visit Read More

Are you experiencing problems with your printing queue? Perhaps you’ve got a whole bunch of print jobs in the spooler (printing queue) and a single print job has gone bad, freezing the entire queue. Or maybe you just want to know, for future reference, how you can cancel any print job that you’ve started? How to Clear Print Jobs from within the Typical Printing Queue Interface Firstly, open up the Devices and Printers interface. This can be found in the Hardware and Sound section of the Control Panel. Right-click on Read More

NAND gates are basic logic gates that are used in a number of electronic circuits. An electrician can use a NAND gate to build any other logic gate when it is used with a NOR gate. Therefore, it is sometimes referred to as a universal gate. The most common NAND gate is a two-input gate, which can be created and used with more inputs. NAND gates can be incorporated into a large, integrated circuit and a discrete circuit. A standard microprocessor chip contains several million NAND gates, which will output Read More

The index of refraction (refractive index) is a measurement of the speed of light in a medium compared to the speed of light in a vacuum. Since light travels at different speeds in different materials, it may change its direction. For example, the index of refraction for water is 1.33, meaning that light travels 1.33 times as fast in a vacuum as it does in water. This is why light bends when it comes in contact with the surface of water. Likewise, light travels at different speeds through materials at Read More

DiSEqC stands for Digital Satellite Equipment Control. DiSEqC is a communication bus between satellite receivers and peripheral equipment such a LNBs, switches, and antenna positioners. DiSEqC communication occurs over the existing coaxial cable. Eutelsat developed DiSEqC and released it to the public as an open standard. DiSEqC Specifications Bus Specification Logos and their Conditions of Use Slave Microcontroller Specification Update and Recommendations for Implementation Application Information for using a “PIC” Microcontroller in DiSEqC LNB and Simple Switcher Applications Application Information for Tuner-Receiver/IRDs Application Information for LNBs and Switchers Reset circuits Read More

The battery that comes with the MacBook Pro will eventually need to be replaced as it is a consumable item with a finite usable life. The battery can be purchased directly from Apple Inc. or from a third party manufacturer. Only the batteries that Apple produce are really recommended as third party manufacturers may not produce quality batteries at lower prices. Purchasing the battery from Apple also allows the owner to get the service of having a new battery installed and the old one disposed of. Anyone with access to Read More